Sony Discman D-50MkII User manual

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|
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_ [REVISED
Discard D-50MkH/D-7S
SERVICE MANUAL
(No. 9-952-109-11)
previously issued.
STEP/MIN “SEC
Refer to BP-200 Service Manual issued previously for information
of rechargeable battery pack supplied with this set.
US Model
Canadian Model
‘D-SOMkII:
AEP Model
UK Model
_ E Model
_ AUS Model
FRENCH Model
| Dutch Model
Pisthan
SPECIFICATIONS
System Compact disc digital audio system General
Disc Compact disc Power requirements Lead acid battery (closed type)
Material: GaAlAs
Wavelength: 780nm
Emission duration: Continuous
Laser output: Max. 0.4mvV*
*This output is the value measured at a distance of about
1.6 mm from the objective lens surface on the Optical Pick-up
Block.
500r.p.m. to 200r.p.m. (CLV)
Laser diode properties
Spindie speed
Scan
velocity
1.2-1.4misec.
Error
correction
Sony
Super
Strategy
Cross
Interleave
Reed
Solomon
Code
Number of channels 2
D-A
conversion
16-bit
linear
Frequency
response
20--20,000
Hz‘}dB
Total
harmonic
distortion
Less
than
0.008
%
Oynamic
range
More
than
90d8
(1
kHz)
Wow
and
flutter
Below
measurable
limit
Outputs
(at
9V
input
level)
Line
output
(stereo
minijack)
Output level 1.6V rms
Load impedance over 10 kilohms
Headphones (stereo minijack)
30 mW + 30 MW at 32 ohms
CAUTION
@ Use of controls or adjustments or performance of
procedures other than those specified herein may
result in hazardous radiation exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
A ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
using Sony BP-200 rechargeable battery pack (supplied), 6V
Eight IEC designation LR6 atkaline batteries (size AA)
using Sony EBP-380 battery case (optional), 12V
DC IN 9V jack accepts;
Sony ac power adaptor (supplied)
For use in US, Canadian Model on
120V ac, 60 Hz
For use in UK, AUS Model on 240V ac, 50 Hz
For use in AEP, Dutch Model on 220V ac, 50 Hz
For use in E Model on 110, 120, 220, or 240V ac,
50/60 Hz
Sony DCC-120 car battery cord (optional) for use on 12V car
battery
Power consumption 2.6W dc
Dimensions
Approx. 125.927 x 125.9mm (w/hid)
(5x 1/,x5 inches)
not incl. inclined part (depth)
not inct. projecting parts and controls
Approx. 126.9 «31.5 132.5 mm (wihid)
(5x 1/,x5Y, inches)
incl. projecting parts and controls
Weight Approx. 510g (11!b 2.02), net
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET
UNE MARQUE A SUR LES DIAGRAMMES SCHE-
MATIQUES ET LA LISTE DES PIECES SONT CRITIQUES
POUR LA SECURITE DE FONCTIONNEMENT. NE REM-
PLACER CES COMPOSANTS QUE PAR DES PIECES
SONY DONT LES NUMEROS SONT DONNES DANS CE
MANUEL OU DANS LES SUPPLEMENTS PUBLIES PAR
SONY.
COMPACT DISC COMPACT PLAYER
MICROFILM
SONY.

FEATURES
@ Extremely compact size for easy carrying
@ High performance and high fidelity
@ AMS (Automatic Music Sensor) for quick location of selections
@ Search function for quick location of a desired point in a particular selection
@ RMS (Random Music Sensor) allows selections to be played in a specified
order.
© Shuffle-play function repeatedly plays selections in a random order.
@ Repeat functions for the whole disc and for a particular portion
@ Digital readout display—the track number on the disc and the elapsed or re-
maining playing time are shown on the LCD (Liquid Crystal Display) window.
TROUBLE SHOOTING GUIDE
Disc play does not start.
@ The POWER switch is set to OFF.
@ The disc is inserted with the labeled surface face down.
@ The disc is incorrectly inserted.
@ Dusty or defective disc
@ Dirty or dusty lens
@ The disc compartment lid is not closed.
@ Moisture condensation
@ The ac power adaptor is not plugged to the wall outtet.
@ Weak battery
@ The car battery cord is not firmly connected.
No sound from headphones
@ The headphones plug is not firmly connected to the PHONES jack.
No sound from speakers
@ Incorrect connections
@ The amplifier is not turned on,
Skipping of sound
@ Dirty or defective disc
@ Dirty lens
@ Strong vibration
MAINTENANCE
CLEANING THE CASING ‘
Clean the casing with a soft cloth slightly moistened with water or mild dete:
gent solution. Do not use any type of abrasive pad, scouring powder or solve=i
such as alcohol or benzine as they may mar the finish of the casing.
CLEANING THE LENS
If you have accidentally touched the lens with a dirty finger or the dust ont t
lens prevents the set from operating properly, open the disc compartment ti
with the OPEN button and clean the lens.
To remove dust
Blow on the lens a few times with a commercially available blower, brush t t
dust away in the direction of the arrow, then blow on the lens again.
Blower
NOTES ON COMPACT DISCS
O.
Handle the disc by its edge, and |
keep the disc clean do not touch tf
rainbow colored surface.
apa | Do not stick paper or tape nor wer?
anything on the labeled surface.
Do not expose the disc to direct sunlight or heat sources such as hot air duct
nor leave it in a car parked in direct sunlight where there can be a considera t?
rise in the temperature.
Before playing, clean the disc with the optional
cleaning cloth.
Wipe the disc from the center out.
Do not use solvents such as benzine, thinner,
commercially available cleaners or anti-static
spray intended for analog discs.
After playing, store the disc in its case.
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omens
Servicehilfe
Datum:
25.08.86
Ref.:
DA-O3886
Modell:
D-SOMKII
(D-7S)
DISC-TELLER
DREHT
SICH
NICHT
Code:
Has/scho
Fehlererscheinung:
Der
Disc-Teller
drenht
sich
nicht,
obwohl
der
Disc-Motor
lauft.
Ursaches
Das
Yahnmrad
des
Disc-Tellers
ist
auf
der
Welle
ver-
ruts\ent.
Gbhilfe:
Zahnrad
des
Disc-Tellers
aut
die
Messinghiilse
der
Welle
he
schieben,
Sicherungslack
auftragen
und
das
Zahnrad
mit
}
dem
Stopper
festsetzen.
Varfahrens
1.
Disc-Teller
in
Ffeilrichtung
driicken
und
Zahnrad
aufstecken
(siehe
Bild
1).
Zahnrad
ne
:
AE
Poa
4
\pise-Teller
Se
Messinghiilse
so
weit
herunterdriicken,
dai
sie
biindig
mit
der
Oberflache
des
Zahnrades
abschliefit
(Bild
2).
tehatoen)
Fephod a2:
Arieibeatiies
|
bo
Abteilung
Technische
Information
a
“SONY
DEUTSCHLAND.
GmbH,
Hugo-Eckener-StraBe
20,
5000
Koln
30,
Tel.:
(02
21)
5966-1

SONY
Servicehilfe
|
Sicherungslack
auf
die
Anschiufistelle
auftragen,
dabei
den
Disc-Teller
drehen.
aN)
Sicherungslack
4.
Disce-Teller
entsprechend
Hild
1
nach.oben
driicken
und
gleich-
zeitiqg
den
Stopper
1
anbringen
und
mit
dem
dazugehorigen
Stabchen
fest
andritcken.
Reparatursatz
-
ET.-Nr.:
X-4907-035-1
Abstandsstiicke
so / we |
Stabchen 74
FTrvrcsineenoe
snot
HULL
——————
5.
Hoheneinstellung
des
Disc-Tellers
Konterschraube
entsprechend
der
Dicke
des
Abstandsringes
justieren;
die
Disc-Tellerhdhe
lafst
sich
durch
Abstandsstiicke
verandern.
(Im
Reparatursatz
enthalten)
Zahnrad
Disc-Teller
Finstellverfahren:
1.
Konterschraube
um
120
Grad
nach
rechts
dre-
hen.
2.
Konterschraube
mit
Lack
sichern.
Anmer
kung:
Die
Konterschraube
nicht
zu
fest
anziehen,
da
Sich
sonst
die
Héhe
verandert,
sobald
der
Schraubendreher
herausgezogen
wird.
Abteilung
Technische
Information
a
SONY
DEUTSCHLAND
GmbH,
Hugo-Eckener-StraBe
20,
5000
KOin
30,
Tel:
(0221)
59
66
-1

Sa
'— CAUTION FOR ELECTROSTATIC BREAKDOWN —
NOTES
ON
HANDLING
THE
OPTICAL
PICK-UP
BLOCK
(KSS-110G)
The
laser
diode
in
the
optical
pick-up
block
may
1.
Place
a
conductive
sheet
on
the
workbench.
suffer
electrostatic
breakdown
because
of
the
poten-
(The
black
sheet
used
as
repair
parts
wrapping).
tial
difference
generated
by
the
charged
electrostatic
2.
Place
the
set
on
the
conductive
sheet
so
that
load, etc. on clothing and the human body. } the chassis touches the sheet. (This makes it the
The
printed
matter
below
is
included
in
the
repair
same
potential
as
the
conductive
sheet).
arts,
During
repair,
use
the
procedure
in
the
printed
:
ca
P 7
3.
Place
your
hands
on
the
conductive
sheet.
(This
matter.
:
The
flexible
board
is
easily
damaged
and
should
be
makes
them
the
same
potential
as
the
sheet).
handled
with
care.
4.
Remove
the
optical
pick-up
block.
The
following
method
is
an
example
for
reference
5.
Perform
work
on
top
of
the
conductive
‘sheet.
purposes:
Be careful that clothing does not touch the
optical pick-up block.
Printed Matter Included in the Repair Parts
When
opening
or
repairing
the
unit,
the
procedure
for
grounding
as
follows
is
required
to
prevent
damage
caused
by
static
electricity.
Grounding for the human body
Be
sure
to
put
on
a
wrist-strap
for
grounding
(with
impedance
lower
than
10®
(2)
whose
other
end
is
grounded,
The
strap
works
to
drain
away
the
static
electricity
build-up on
the
human body.
Grounding
for
the
work
table
Be
sure
to
lay
on
the
table
a
conductive
sheet
(with
impedance
lower
than
10°
Q)
such
as
sheet
of
copper, which
is grounded.
As
static
electricity
build-up
on
clothes
is
not
drainded
away,
be
careful
not
to
let
your.clothes
touch
the
unit.
Handling the flexible board
The flexible board is easily damaged and should be handled with care.
@ Wrist-strap
for grounding
The unit

Chip Component Indications
The official specifications which are presently indicated
are EIAJ standard.
(1) MELF (leadless): EIAJ RC-8001
(2) Square chip components (laminated ceramic):
EIAJ RC-3699. Square chip resistors are presently
under study by EIAJ.
The following explanation covers square chip components
(MELF omitted).
1. 2-letter Method (EIAJ RC-3699)
e Letter combination:
@ Letter meaning:
letter + 1 number
letter = effective numeric
“number = multiplier
* The units used are pF for capacitors and Q (ohm) for
resistor.
(This is mainly used for Symbol and Numeric and Multi-
plist capacitors.)
ESOC nG cone
fwamere|t [i.fra[valis|ie|tal2 [ealaaiaa|
juste [wwe otal s |r} uly (wl x!
[Numeio|3_|3.3]36/2.0]4.9|4.7/6.1[5.6]82]6¢/7.5|
Se eee
1x 10!
E3 1.5 x 10°
= 10 pF (or, 1022)
= 1500 pF (or, 1.5 kQ)
2. 3-number Method
(Mainly used for chip resistors)
° Number meaning:
Ist and 2nd number = effective numeric
3rd number = multiplier of 10
. Unit: .pF for capacitor, for resistor —
1000092 = 10 kQ
(or, 0.01 uF)
2200002 = 220 kQ
(or, 0.22 uF)
@ Ex.: 103 10 x 10°
224 22 x 10*
3. 4-letter Method (used for capacitor)
@ Letter combination:
@ Letter meaning:
3 numbers + 1 letter
number = effective numeric +
multiplier of 10
(same as 3-number method)
letter = capacitor response
® Symbol and Response
( For temperature compensation )
emis Te [*[* [8] [vor
[Rewonm [os] ra [na [se [ra [us [st |
A is temperature coefficient tolerance, and is G, H,
J,K.
(For high dielectric constant) —
symoo [ [2
Frenne |e [F |
@ Ex.:
47 a
m= 47x 10° = 47000pF = 0.047uF F response
[Fe |p sss = 150pF
22
?|> 22x10? = 2200pF
RA response
SL response

Replacing chip components
All chip components should be connected and disconnect-
ed, using a tapered soldering iron [temperature of the iron
tip: less than 280°C (536°F)], a pair of tweezers and braid-
ed wire.
Precautions for replacement
1. Do not disconnect the chip component forcefully.
Otherwise, the pattern may peel off.
2. Never re-use a disconnected chip component. Dispose of
all old chip components. _
3. To protect the chip component, heating time for attach-
ing the component should be within 3 seconds.
© Removing chip components
(1) Removing solder at electrode
Remove the solder at the electrode, using a thin
braided wire. Do not remove the solder of the part
(chip component) attached adjacent to the electrode.
Pattern Soldering iron
Braided wire
(2) Disconnecting chip components
Turn the tweezers with the soldering iron alternately
applied to both electrodes, and the chip component
will be disconnected. Take careful precautions while
disconnecting, because if the chip component is force-
fully removed the land may peel off.
_ Never re-use a disconnected chip component.
Tweezers —
Turn
(3) Smoothing the soldered surface hoied
After disconnecting the chip component, remove the
solder by using a braided wire to smooth the land
surface. ;
© Connecting chip components
The value of chip components is not displayed on the
main body. Take due precautions to avoid mixing new
chip components with other ones.
(1) Applying solder to land on one side
Apply a thin layer of solder to the land on one side
where the chip component is to be connected. Too
much solder may cause bridging.
Small quantity of solder
a
(2) Speedy soldering
Hold the chip component at the desired position,
using tweezers, and apply the soldering iron in the
arrow-marked direction. To protect the chip compo-
nent, heating time should be within 3 seconds.
oA
Soldering iron
Land Printed circuit board
(3)
Speedy
soldering
of
electrode
on
the
other
side
Solder
the
electrode
on
the
other
side
in
the
same
—
way
as
in
(2)
above.
:

Flexible
Circuit
Board
Repairing
é
To
make
thermal
controller
of
soldering
iron
connector
1. Keep the temperature of the soldering iron at
270° + 10°C during repairing.
You can maintain the temperature of the
soldering iron around 270°C by using the ther-
mal controller as illustrated on the right.
2. Do not touch the soldering iron more than 4
seconds or 3 times on the same conductor of
the circuit board.
3. Do not apply force on the conductor when
soldering or unsoldering.
(voltage resistant:
1.4kV)
_ Part No.
8-719-210-66
Tip of soldering iron
solder
good wrong
eee eee
ae
OR
EEA
COE
soldering iron
= ASS
wind insulating tape.
===
PC BOARDS/SWITCH/MOTOR LAYOUTS
optical pick-up block (FOP)
sled motor
(M901)
open/close
switch
limiter
board
KSS-110G
(S802) servo board
laser on switch
(S507)
LCD module
(ND801) P
Power switch
(S401) ,
spindle motor
(M902)
SW board
limit switch
(S807)

SERVICE MODE (service program)
As shown on page 17, the program on
this set selects either service program
routine or normal routine after power
supply is connected and a RESET
signal enters. When it enters service
program routine, the microcomputer
brings the necessary job from each
subroutine corresponding to the key
input, and executes that job. Opera-
tion check can be performed efficient-
ly using this mode. The operation
method of service mode is explained
below. ,
iS MKEY
PRESSED?
s809 CHECK
(IC8o1 ‘®)
YES
_ SERVO ALL OFF
POWER ON
INITIAL SETTING
LCD LIGHTING START
iS PERKEY
—-— POWER ON RESET
PRESSED?
YES
$806
CHECK
(1c801
(14))
a
FOCUS
ON
ARE
SPINDLE
veg
“
MOTOR
ROTATED?
(PAGE
9
FIG.
4)
.
NO
SPINDLE
AUTO
IS
PRIOR
Ke
KEY
PRESSED?
YES
$807,
808_CHECK
(1C801
42),
43)
NO
TRACKING
SERVO TURNS
OFF
AND OPTICAL PICK-UP MOVES.
IS’ KEY-MODE
KEY PRESSED? YES
S805 CHECK
(1C801
)
NO TRACKING, SLED SERVO ON
IS REMAIN KEY
PRESSED?
$804 CHECK
(IC801 @6))
YES
LCD. DISPLAY STOP
Fig. 1 Service Program Flow Chart
—7J—-

NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to
be focused on the disc reflective surface by the objec-
tive lens in the optical pick-up block. Therefore,
when checking the laser diode emission, observe,
from more than 30 cm away from the objective lens,
Laser Diode Check Procedure
The laser diode on this set will not emit unless the
top panel is closed and S501 (terminal sorting type),
$802 (leaf SW type) are turned. on. :
Focus search can be operated in service mode even if
S802
is
OFF,
so
that
the
laser
diode
will
emit
if
$501
(terminal shorting type) are turned on in this mode.
The laser diode is checked using the current value
which flows to the laser diode inside the FOP.
Procedure 1 (service mode or normal operation).
Check the laser diode emission with the eye.
1, Open upper panel and turn $501, 802 on as
Fig. 5. In the service mode, turn on $501
only.
2. Press the pill key.
3. Observe the objective lens and confirm that
the laser diode is emitting light. At this time,
the laser diode goes on about 3 seconds due
to focus search. If it does not, APC circuit
or FOP is defective.
Short-circuit with tweezers.
Procedure 2 (service mode or normal operation).
Check by the curent with flows in the laser diode.
1. Close the top panel.
2. Remove the main board and read the current
value on the label affixed to the FOP.
(Label on FOP)
SONY Japan
LASER POWER 0.4mW MAX.
KSS-110G
07740 _ current value
This means 49.9 mA,
The current value varies with the set.
3. Connect a VOM as shown in Fig. 6.
4. Press the > key,
5. Calculate the current. by the VOM reading.
VOM reading (V) + 19.5 = current (A).
ex. VOM reading = 0.97 V ;
0.97 = 19,5 = 0.0497 (A) = 49.7 (mA)
6.
Confirm.that
the
ammeter
reading
is
within
the
range
given
below,
value
on
label
}mA
(25°C)
variation relative to temperature:
0.4 mA/°C |
(Current increases when temperature rises
and
decreases
when
it
drops.)
If
the
value
is
more
than
the
range
given,
APC
circuit
has
been
defective
or
the
laser
diode
has
deteriorated,
If
it
is
less,
APC
circuit
or
FOP
is
defective.
VOM
(dc 3 V range)
Fig. 6 VOM Connection